H - Electricity – 04 – K
Patent
H - Electricity
04
K
340/70
H04K 1/00 (2006.01) H04K 1/06 (2006.01)
Patent
CA 1263463
ABSTRACT OF DISCLOSURE A communications scrambler operates on a digital basis in which digital or digitised incoming and outgoing signals are merged (60) into a single bit stream for application to a binary bit store (12) and retrieval therefrom for separation (62) of those signals. Multi-bit segments of each signal represent unintelligibly fragments of those signals and are stored and read-out under control of store addressing counters (36, 38, 76) whose outputs are selectively modified (48, 50) to achieve time-dispersion encryption/decryption for outgoing/incoming signals in multi-plexed writing and reading of the store (12). Digitisation (52, 54)and reconstitution (64, 66) of analogue incoming and outgoing signals is provided using inherently digital on-chip circuitry and one-bit per sample at a high rate for easy interfacing in telephone/radio systems. The whole control system can be put onto a simple semi- conductor chip of ULA type.
480677
Austin Kenneth
British Encryption Technology Limited
Fetherstonhaugh & Co.
Pilkington A.e.p. Limited
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